Importance of angle of twist:
Q: What is the importance of angle of twist?
From relation T/J = G. θ /L ; we have θ= T.L/G.J
As G,L,J are constants for a given shaft,
the angle of twist is proportional to twisting moment.
A shaft, for which angle of twist is significant, should be designed or checked for angle of twist in addition to design stresses in shafts.